LM431 - Adjustable Precision Zener Shunt Regulator
Datasheet Packaging Samples & Pricing Reliability Design Tools Reference Designs Knowledge Base

Features
•Average temperature coefficient 50 ppm/°C
•Temperature compensated for operation over the full temperature range
•Programmable output voltage
•Fast turn-on response
•Low output noise
•LM431 in micro SMD package
•See AN-1112 for micro SMD considerations

General Description

The LM431 is a 3-terminal adjustable shunt regulator with guaranteed temperature stability over the entire temperature range of operation. More...


  Typical Application
click for larger image


ParametersValues
Initial Accuracy (+/-) Max 1 %
Reference Voltage Adjustable
Tempco, max (ppm/C) 54 ppm
Operating Current 1 mA
Output Current 100 mA
Reference with respect to Anode (low side)
Temperature Min -40 deg C
Temperature Max 85 deg C


Typical Performance

click for larger image


  Also Recommended
LM4120▲Lower Supply Current, Lower Temperature Coefficient & Enable Pin
LM4125▲Lower Supply Current, Lower Temperature Coefficient
LM4128▲Lower Supply Current, Lower Temperature Coefficient & Enable Pin
LM4132▲Lower Supply Current, Lower Temperature Coefficient & Enable Pin
LMV431▲Low Voltage (1.24V)
Additional Resources
Online Seminars Design Tools


Connection Diagram

click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM431 Adjustable Precision Zener Shunt Regulator 872
Kbytes		 18-Mar-05 Download
LM431 Adjustable Precision Zener Shunt Regulator (Japanese)
 543 Kbytes   Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.


Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
Format
TypePinsSpec.MSL
Rating		Peak
Reflow		RoHS
Report		CAD
Symbols		WeeksQtyQty$US each
LM431CCMSOIC NARROW8NOPB1260RoHS Download Lifetime buyN/A
 
Buy Now 		1K+$0.31rail
of
95		NSZXTT
431
CCM
8 weeks7500
LM431ACMSOIC NARROW8NOPB
STD		1
1		260
235		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.23rail
of
95		NSZXTT
LM431
ACM
8 weeks2500
LM431AIMSOIC NARROW8NOPB
STD		1
1		260
235		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.20rail
of
95		NSZXTT
LM431
AIM
8 weeks5000
LM431BCMSOIC NARROW8NOPB
STD		1
1		260
235		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.25rail
of
95		NSZXTT
431
BCM
8 weeks2500
LM431BIMSOIC NARROW8NOPB
STD		1
1		260
235		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.22rail
of
95		NSZXTT
431
BIM
8 weeks2500
LM431CIMSOIC NARROW8NOPB
STD		1
1		260
235		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.34rail
of
95		NSZXTT
431
CIM
8 weeks2000
LM431BIMXSOIC NARROW8NOPB1260RoHS Download Lifetime buyN/A
 
Buy Now 		1K+$0.22reel
of
2500		NSZXTT
431
BIM
8 weeks3000
LM431CCMXSOIC NARROW8NOPB1260RoHS Download Lifetime buyN/A
 
Buy Now 		1K+$0.31reel
of
2500		NSZXTT
431
CCM
8 weeks3000
LM431CIMXSOIC NARROW8NOPB1260RoHS Download Lifetime buyN/A
 
Buy Now 		1K+$0.34reel
of
2500		NSZXTT
431
CIM
8 weeks15000
LM431ACMXSOIC NARROW8NOPB
STD		1
1		260
235		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.23reel
of
2500		NSZXTT
LM431
ACM
8 weeks3000
LM431AIMXSOIC NARROW8NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.20reel
of
2500		NSZXTT
LM431
AIM
8 weeks10000
LM431BCMXSOIC NARROW8NOPB
STD		1
1		260
235		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.25reel
of
2500		NSZXTT
431
BCM
8 weeks20000
LM431ACM3SOT-233NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.22reel
of
1000		N1F
XTT
8 weeks5000
LM431AIM3SOT-233NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.20reel
of
1000		N1E
XTT
8 weeks3000
LM431BCM3SOT-233NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.23reel
of
1000		N1D
XTT
8 weeks2500
LM431BIM3SOT-233NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.22reel
of
1000		N1C
XTT
8 weeks3000
LM431CCM3SOT-233NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.31reel
of
1000		N1B
XTT
8 weeks5000
LM431CIM3SOT-233NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.37reel
of
1000		N1A
XTT
8 weeks5000
LM431ACM3XSOT-233NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.22reel
of
3000		N1F
XTT
8 weeks25000
LM431AIM3XSOT-233NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.20reel
of
3000		N1E
XTT
8 weeks15000
LM431BCM3XSOT-233NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.23reel
of
3000		N1D
XTT
8 weeks75000
LM431BIM3XSOT-233NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.22reel
of
3000		N1C
XTT
8 weeks15000
LM431CCM3XSOT-233NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.31reel
of
3000		N1B
XTT
8 weeks5000
LM431CIM3XSOT-233NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.37reel
of
3000		N1A
XTT
6 weeks10000
LM431BIZTO-923NOPB1NARoHS Download Lifetime buyN/A
 
Buy Now 		1K+$0.22box
of
1800		NSXYTT
LM431
BIZ
8 weeksN/A
LM431CCZTO-923NOPB
STD		1
1		NA
NA		RoHS Download Lifetime buyN/A
 
Buy Now 		1K+$0.31box
of
1800		NSXYTT
LM431
CCZ
8 weeks2000
LM431ACZTO-923NOPB
STD		1
1		NA
NA		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.22box
of
1800		NSXYTT
LM431
ACZ
8 weeks10000
LM431AIZTO-923NOPB
STD		1
1		NA
NA		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.20box
of
1800		NSXYTT
LM431
AIZ
8 weeks25000
LM431BCZTO-923NOPB
STD		1
1		NA
NA		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.23box
of
1800		NSXYTT
LM431
BCZ
8 weeks2500
LM431CIZTO-923NOPB1NARoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.34box
of
1800		NSXYTT
LM431
CIZ
8 weeks3000

Obsolete Versions

Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM431AC MDC
NONE
NATIONAL SEMICONDUCTOR
03 Dec 2008
LM431AIBP
LM431AIM
NATIONAL SEMICONDUCTOR
05 Mar 2008
LM431AIBPX
LM431AIM
NATIONAL SEMICONDUCTOR
05 Mar 2008
LM431AITP
LM431AIM
NATIONAL SEMICONDUCTOR
05 Mar 2008
LM431AITPX
LM431AIM
NATIONAL SEMICONDUCTOR
05 Mar 2008
LM431BIMX
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM431BIZ
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM431CCM
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM431CCMX
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM431CCZ
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM431CIMX
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM431J-MLS
NONE
NONE
07 Jun 2001

General Description

The LM431 is a 3-terminal adjustable shunt regulator with guaranteed temperature stability over the entire temperature range of operation. It is now available in a chip sized package (4-Bump micro SMD) using National's micro SMD package technology. The output voltage may be set at any level greater than 2.5V (VREF) up to 36V merely by selecting two external resistors that act as a voltage divided network. Due to the sharp turn-on characteristics this device is an excellent replacement for many zener diode applications.

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM431ACMSLM04404600353250011002356520
LM431ACM3SLM04404600353250011002356520
LM431ACM3XSLM04404600353250011002356520
LM431ACMXSLM04404600353250011002356520
LM431ACZSLM04404600353250011002356520
LM431AIMSLM04404600353250011002356520
LM431AIM3SLM04404600353250011002356520
LM431AIM3XSLM04404600353250011002356520
LM431AIMXSLM04404600353250011002356520
LM431AIZSLM04404600353250011002356520
LM431BCMSLM04404600353250011002356520
LM431BCM3SLM04404600353250011002356520
LM431BCM3XSLM04404600353250011002356520
LM431BCMXSLM04404600353250011002356520
LM431BCZSLM04404600353250011002356520
LM431BIMSLM04404600353250011002356520
LM431BIM3SLM04404600353250011002356520
LM431BIM3XSLM04404600353250011002356520
LM431BIMXSLM04404600353250011002356520
LM431BIZSLM04404600353250011002356520
LM431CCMSLM04404600353250011002356520
LM431CCM3SLM04404600353250011002356520
LM431CCM3XSLM04404600353250011002356520
LM431CCMXSLM04404600353250011002356520
LM431CCZSLM04404600353250011002356520
LM431CIMSLM04404600353250011002356520
LM431CIM3SLM04404600353250011002356520
LM431CIM3XSLM04404600353250011002356520
LM431CIMXSLM04404600353250011002356520
LM431CIZSLM04404600353250011002356520

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.


Design Tools

TitleSize in Kbytes Date Click link below to Download    
LM431AIBP Micro SMD Qualification Package 4172 Kbytes 17-Apr-2000 View Online Download  

If you have trouble printing or viewing PDF file(s), see Printing Problems.


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[Information as of 7-Nov-2009]